Captain Sir Charles MacMahon (10 July 1824 – 28 August 1891)[1] was an Australian politician who twice served as Speaker of the Victorian Legislative Assembly and as Chief Commissioner of Victoria Police.

MacMahon was born County Tyrone, Ireland, to a wealthy Irish family and served in the British army.

[2] On 25 November 1853,[3] MacMahon was appointed Assistant Commissioner of Police by William Henry Fancourt Mitchell and a member of the Victorian Legislative Council.

[4] Charles was the son of the Right Honorable William MacMahon, an Irish judge, and his second wife Charlotte née Shaw.

[4] Charles MacMahon was twice married; first, to Sophie Campbell, sister of a Canadian barrister who became a magistrate at Beechworth, Victoria; and second, to Clara Ann, daughter of C. J. Webster of Yea.